I started out with a stuck float needle when I tried to fire up my motor for the season. No problem, I've had this happen before. Pulled the vst,wasn't too bad, and yep, stuck valve. Get it all back together, now, I get nothing. No fuel, no fuel pump comes on when I turn on the key, nothing. Put a test light on the red wire and ground. It lights. Check between the red and blue, no light? Check voltage at pump leads, around 8v +- . Just to see, I put 12v to pump, it runs? I just don't know enough about this, I was sure the pump had bought the farm, but it still runs with 12v? Is 8v correct at turn key? I even checked the resistor, it reads a little low, .37 or so? HELP PLEASE, I'm driving myself nuts with this, am I missing something or just overthinking a bad pump?
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2000 ox66 250 fuel pump issues
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I did normally hear it come on when I would turn on the key to build up pressure, it no longer does this at all. I don't have a pressure gauge, but when I press the schraeder valve, I get zip. Is it normal to be able to get the pump to run on full 12v, but not on the lower voltage at the leads?
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its a stupidly simple 2 speed 12V pump.
at key on the pump and injectors get 12V via the main relay.
the ECU controls the ground path.
at key on the resistor is bypassed.
at RPM above about 1200 the resistor is bypassed.
the resistor will drop pump operating voltage to about 9 volts below 1200 RPM to prevent running the pump in a stalled condition.
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Haven't been able to work on my problem for a while, work and all. I finally got hold of an ohmmeter to test the fuel pump resistor. It reads full continuity. I had it set on the 0-10 scale and it pegs the needle.
My question is if the resistor was bad, would it read as an open circuit? Did it somehow short out? And if it did, shouldn't I get full power at the pump leads? Any ideas on what to try next, I plan to try to get a new resistor, but I'm afraid of frying it too if there is some other issues I should look for?
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